Effects of Coupling, Bubble Size, and Spatial Arrangement on Chaotic Dynamics of Microbubble Cluster in Ultrasonic Fields

Microbubble clustering may occur when bubbles become bound to targeted surfaces or are grouped by acoustic radiation forces in medical diagnostic applications. The ability to identify the formation of such clusters from the ultrasound echoes may be of practical use. Nonlinear numerical simulations w...

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Main Authors:	Fatimah, Dzaharudin, Suslov, Sergey A., Manasseh, Richard, Ooi, Andrew
Format:	Article
Language:	English English
Published:	Acoustical Society of America 2013
Subjects:	QA Mathematics R Medicine (General) TJ Mechanical engineering and machinery
Online Access:	http://umpir.ump.edu.my/id/eprint/11714/ http://umpir.ump.edu.my/id/eprint/11714/ http://umpir.ump.edu.my/id/eprint/11714/ http://umpir.ump.edu.my/id/eprint/11714/1/Dzaharudin2013.pdf http://umpir.ump.edu.my/id/eprint/11714/7/fkm-2013-fatimah-effects%20of%20coupling.pdf

id	ump-11714
recordtype	eprints
spelling	ump-117142018-01-11T07:11:46Z http://umpir.ump.edu.my/id/eprint/11714/ Effects of Coupling, Bubble Size, and Spatial Arrangement on Chaotic Dynamics of Microbubble Cluster in Ultrasonic Fields Fatimah, Dzaharudin Suslov, Sergey A. Manasseh, Richard Ooi, Andrew QA Mathematics R Medicine (General) TJ Mechanical engineering and machinery Microbubble clustering may occur when bubbles become bound to targeted surfaces or are grouped by acoustic radiation forces in medical diagnostic applications. The ability to identify the formation of such clusters from the ultrasound echoes may be of practical use. Nonlinear numerical simulations were performed on clusters of microbubbles modeled by the modified Keller-Miksis equations. Encapsulated bubbles were considered to mimic practical applications but the aim of the study was to examine the effects of inter-bubble spacing and bubble size on the dynamical behavior of the cluster and to see if chaotic or bifurcation characteristics could be helpful in diagnostics. It was found that as microbubbles were clustered closer together, their oscillation amplitude for a given applied ultrasound power was reduced, and for inter-bubble spacing smaller than about ten bubble radii nonlinear subharmonics and ultraharmonics were eliminated. For clustered microbubbles, as for isolated microbubbles, an increase in the applied acoustic power caused bifurcations and transition to chaos. The bifurcations preceding chaotic behavior were identified by Floquet analysis and confirmed to be of the period-doubling type. It was found that as the number of microbubbles in a cluster increased, regularization occurred at lower ultrasound power and more windows of order appeared. Acoustical Society of America 2013 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/11714/1/Dzaharudin2013.pdf application/pdf en http://umpir.ump.edu.my/id/eprint/11714/7/fkm-2013-fatimah-effects%20of%20coupling.pdf Fatimah, Dzaharudin and Suslov, Sergey A. and Manasseh, Richard and Ooi, Andrew (2013) Effects of Coupling, Bubble Size, and Spatial Arrangement on Chaotic Dynamics of Microbubble Cluster in Ultrasonic Fields. The Journal of Acoustical Society of America, 134 (5). pp. 3425-3434. ISSN 0001-4966 http://dx.doi.org/10.1121/1.4821202 DOI: 10.1121/1.4821202
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English English
topic	QA Mathematics R Medicine (General) TJ Mechanical engineering and machinery
spellingShingle	QA Mathematics R Medicine (General) TJ Mechanical engineering and machinery Fatimah, Dzaharudin Suslov, Sergey A. Manasseh, Richard Ooi, Andrew Effects of Coupling, Bubble Size, and Spatial Arrangement on Chaotic Dynamics of Microbubble Cluster in Ultrasonic Fields
description	Microbubble clustering may occur when bubbles become bound to targeted surfaces or are grouped by acoustic radiation forces in medical diagnostic applications. The ability to identify the formation of such clusters from the ultrasound echoes may be of practical use. Nonlinear numerical simulations were performed on clusters of microbubbles modeled by the modified Keller-Miksis equations. Encapsulated bubbles were considered to mimic practical applications but the aim of the study was to examine the effects of inter-bubble spacing and bubble size on the dynamical behavior of the cluster and to see if chaotic or bifurcation characteristics could be helpful in diagnostics. It was found that as microbubbles were clustered closer together, their oscillation amplitude for a given applied ultrasound power was reduced, and for inter-bubble spacing smaller than about ten bubble radii nonlinear subharmonics and ultraharmonics were eliminated. For clustered microbubbles, as for isolated microbubbles, an increase in the applied acoustic power caused bifurcations and transition to chaos. The bifurcations preceding chaotic behavior were identified by Floquet analysis and confirmed to be of the period-doubling type. It was found that as the number of microbubbles in a cluster increased, regularization occurred at lower ultrasound power and more windows of order appeared.
format	Article
author	Fatimah, Dzaharudin Suslov, Sergey A. Manasseh, Richard Ooi, Andrew
author_facet	Fatimah, Dzaharudin Suslov, Sergey A. Manasseh, Richard Ooi, Andrew
author_sort	Fatimah, Dzaharudin
title	Effects of Coupling, Bubble Size, and Spatial Arrangement on Chaotic Dynamics of Microbubble Cluster in Ultrasonic Fields
title_short	Effects of Coupling, Bubble Size, and Spatial Arrangement on Chaotic Dynamics of Microbubble Cluster in Ultrasonic Fields
title_full	Effects of Coupling, Bubble Size, and Spatial Arrangement on Chaotic Dynamics of Microbubble Cluster in Ultrasonic Fields
title_fullStr	Effects of Coupling, Bubble Size, and Spatial Arrangement on Chaotic Dynamics of Microbubble Cluster in Ultrasonic Fields
title_full_unstemmed	Effects of Coupling, Bubble Size, and Spatial Arrangement on Chaotic Dynamics of Microbubble Cluster in Ultrasonic Fields
title_sort	effects of coupling, bubble size, and spatial arrangement on chaotic dynamics of microbubble cluster in ultrasonic fields
publisher	Acoustical Society of America
publishDate	2013
url	http://umpir.ump.edu.my/id/eprint/11714/ http://umpir.ump.edu.my/id/eprint/11714/ http://umpir.ump.edu.my/id/eprint/11714/ http://umpir.ump.edu.my/id/eprint/11714/1/Dzaharudin2013.pdf http://umpir.ump.edu.my/id/eprint/11714/7/fkm-2013-fatimah-effects%20of%20coupling.pdf
first_indexed	2023-09-18T22:12:39Z
last_indexed	2023-09-18T22:12:39Z
_version_	1777415130583138304

Effects of Coupling, Bubble Size, and Spatial Arrangement on Chaotic Dynamics of Microbubble Cluster in Ultrasonic Fields

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